Using require.js map configuration to façade module in a way to always load relevant plugins and localization.

config.js

require.config({

  paths: {
    jquery      : "../../vendors/js/jquery/jquery",
    validate    : "../../vendors/js/jquery.validation/jquery.validate",
    validate_fr : "../../vendors/js/jquery.validation/messages_fr"
  },
  map: {
    // Façade modules or swap them for another one
    "*": {
      "validate"   : "facade-validator"
    },
    "facade/validator": {
      "validate": "validate"
    },
    "validate_fr": {
      "validate": "validate"
    }
  }

});

facade-validator.js

define([
  "jquery",
  "validate",
  "validate_fr" // Get the good localization dictionnary - I'll usually use a require plugin here
], function( $ ) {

  // Adding custom validation methods
  $.validator.addMethod( "phone", function( value ) {
    return value.match(/^([01]{1})?[\-\.\s]?\(?(\d{3})\)?[\-\.\s]?(\d{3})[\-\.\s]?(\d{4})\s?((?:#|ext\.?\s?|x\.?\s?){1}(?:\d+)?)?$/i);
  }, function() {
    return "Please give a valid phone number";
  });

  return $.validator;
});

main.js

define([
  "jquery",
  "validate"
], function( $ ) {
  $("form").validate();
});

For the i18n, I usually use require.replace loader plugin so I don't have to specify each locale in the map config, and to load/build only relevant locales without any headaches.